[My5ABaby]

Looking at the wiring, there's a lot of choices.

GPT primary wire
TWP primary wire
GXL cross-link wire
SGT battery wire
SGX battery wire
SXL cross-link wire
TXL cross-link wire

I found this:

When in doubt, use 125°C rated TXL, GXL, SXL, or SGX wire insulation for engine compartment and general wiring. The only difference between these is the thickness of the insulation and cost, with the thicker being the more expensive. They are all insulated with crosslinked polyethylene, which is almost as heat resistant as teflon, but cheaper and much tougher.

TXL is the wire used by vehicle manufacturers for most applications, and is the thinnest, lightest, and lowest cost of these insulations. It is tough and long lasting.

GXL is an intermediate insulation,with thickness and cost between TXL and SXL.

SXL is the second thickest of the crosslinked polyethylene insulations, and suggested for use in the heavier gauges, or where some additional protection from possible mechanical damage is needed.

SGX is the thickest of the crosslinked polyethylene insulations. SGX is particularly recommended for battery cable, because of the rather spectacular consequences of a shorted battery cable.

GPT is a PVC insulated wire rated at 85°C used for general chassis wiring, and should not be used in the engine compartment of your car according to the SAE J1128 spec. It's not as tough or heat resistant as TXL or GXL insulation, but it is considerably cheaper. This is the wire found in retail stores.

Sound about right?

If so, I would presumably go with TXL for most things, SXL in high heat areas (oxygen sensor wire or something), and SGX for battery cable?